XML 57 R44.htm IDEA: XBRL DOCUMENT v3.8.0.1
Change in Accumulated Other Comprehensive Income (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance $ 591,548  
Foreign currency translation gain 251 $ 1,027
Ending Balance 597,183  
Foreign currency translation gain (loss)    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (6,363)  
Foreign currency translation gain 251  
Ending Balance $ (6,112)